Laminating machine for producing composite webs of paper



2,712,342 PAPER July 5, 1955 c. L. CLAFF ETAL LAMINATING MACHINE FOR PRODUCING COMPOSITE WEBS OF 6 SheetsSheet l iled Dec. 5, 1946 Original F Jilly 5, 1955 c. CLAFF ETAL 6 Sheets-Sheet 2 Original Filed Dec. 5, 1946 PAPER July 5, 1955 c. L. CLAFF m-AL LAMINATING MACHINE FOR PRODUCING COMPOSITE WEBS OF 6 Sheets-Sheet Original Filed Dec. 5, 1946 IIII4 July 5, 1955 c. L. CLAFF ETAL LAMINATING MACHINE FOR PRODUCING COMPOSITE WEBS OF PAPER 6 Sheets-Sheet 4 Original Filed Dec. 5, 1946 July 5, 1955 c. L. CLAFF ETAL LAMINATING MACHINE FOR PRODUCING COMPOSITE WEBS OF PAPER 6 Sheets-Sheet 5 Original Filed Dec. 5, 1946 MNN C. L. CLAFF ET AL July 5, 1955 LAMINATING MACHINE FOR PRODUCING COMPOSITE WEBS OF PAPER Original Filed Dec. 5, 1946 LAMINATING MACHINE FOR PRODUCING COMPOSITE WEBS OF PAPER Clarence Lloyd Clati, Chester E. Claif, and Carl A. Moeller, Randolph, Mass., assignors, by mesne assignments, to M. B. Claif & Sons, Inc., Randolph, Mass., a corporation of Massachusetts o'Claim's; (Cl. 154-37) The present invention relates to web forming or laminating machines, as they are sometimes called, for producing composite or'laminated webs of paper or other material, such webs, for example, as those used in blanking machines for making box blanks.

It is the object of the present invention to provide a machine'of this type which shall produce a composite or laminated web from a plurality of separate webs of suitable material with great accuracy and at high'speed.

More specific objects of the present invention are to improve many of the combinations and mechanisms forming essential parts of machines of this type, for example, to provide improved supporting means which will permit replacement of the exhausted rolls of web material with a minimum requirement of time and effort on the part of the operator; also improved adjusting mechanism for properly positioning the rolls and webs with relation to one another; also simple and efiicient tension devices for the webs; improved adhesive applying devices, web guiding devices and devices for turning over or folding the margin of one web over the edge of another web.

To the above ends the present invention consists in a web forming or laminating machine having Web supporting means along which rolls of web material may be easily rolled on their supporting shafts from reserve to operative position; also having devices for adjusting the supporting means to provide for different widths of web, and for properly positioning the web with respect to other webs; also having a pair of rolls for applying glue or other adhesive to one or more of the webs in regulated amounts with provision for collecting and returning to the supply any excess delivered to the rolls; also having mechanism for rendering the gluing rolls inoperative by throwing the webs out of contact therewith; also devices for stopping the machine automatically should paper wind around the gluing rolls; also by providing web guiding devices having provision for adjusting. to accommodate various widths of web and for positioning properly the web with respect to another web;also having independently yielding folding devices for tightly folding the margin of one web over and around the edge of another web, the folding devices having provision for adjustment for varying widths of web.

, United States Patent In the accompanying drawings which illustrate what is now considered to he the preferred construction,

Fig. l is a top plan view and Fig. 2 is a side elevation with parts in section, both somewhat diagrammatic in character, of the complete laminating machine, showing a unit or stand A for supporting and supplying a roll or web of cardboard material, and a second unit B which comprises a stand for supporting and supplying two narrow rolls of reinforcing paper and a Wider roll of white cover paper, together with devices for applying adhesive and assembling the webs to forma composite web of cardboard, reinforcing strips, and cover paper;

Fig. "3 is a perspective view on an.-enlarged scale of. the completed composite web;

2,712,342 Patented July 5, 1955 guides for directing the cardboard web to the assembly or pressure rolls; v

Fig. 8 is a top plan view of the same;

Figs 8 of the web guidesv and their adjusting screws;

Fig. 10 is a top plan view, partly in section, on a still larger scale, of the cardboard web guiding devices, with.

the edge guide members removed.

Fig. 11 is a fragmentary side elevation of the devices for applying adhesive to. the reinforcing strips and to the 7 cover paper; Fig, 12 is a top plan view of the same, with the pressure or assembly rolls omitted;

Fig. 13 is a side. elevation, showing the rolls strips and the cover removing the excess adhesive from the ends of the rolls; Fig. 14is a vertical transverse section of the same on line 14-14 of Fig. 13;

Fig. 15 is a top plan view of one end of the adhesive applying rolls showing the adhesive collectorin position removing excess adhesive from the of Fig. 12 showing the spring mountingat the ends of one of the adhesive applying rolls to move away from the other adhesive paper web should. break and wind up on either roll, with a micro-switch positioned to stop the operation of the machine when such separation of ment of a bearing block take place;

Fig. 18 is a side elevation of-the folding devices for permit such roll to folding the reinforcing strips-and the edges of the cover paper around the edges of the cardboard web;

Fig. 19 is a topplan view of the foldingmembers and their supporting and adjusting mechanism;

Fig. 20 is a vertical section, on an enlarged scale, of the folding members taken on lines 20-20 of Fig. 19;

Fig. 21 is a similar vertical section on line 21-21 of Fig. 19;

Figs. 22, 23 and 24 are sectional details on lines 22, 23, and 24,1 respectively, of Fig. 19, showing the action of the folding members or plows upon the edges of the cover paper and the reinforcing strips to fold the same 7 around the edges ofthe' cardboard web.

The composite web-forming or laminating machine illustrated in the drawing comprises two units, unit. A is a stand or support for the two rolls of cardboard web, one roll supplying the web for immediate use while the other roll serves. as an extra or spare to take the place of the first roll when the latter is exhausted. Unit B, where the composite or laminated web is assembled, is provided with a stand for reinforcing paper or the like, one pair of each set sup plying the reinforcing strips for immediate use in the machine and the other pair being reserveor spare rolls for. replacement use. The stand also carries a pair of rolls of cover paper, one feeding directly tothe assem- Frg. 9 is a vertical transverse section on line 9-9 of on a still larger scale,' applying adhesive to the reinforcing; paper, the devices for applying adhesive to the rolls, and the collector for collecting and the operaapplying roll if the the rolls and movetwo sets of pairs of rolls of bling device of the machine, and the other for replacement when the former is exhausted.

Unit B also contains the mechanism for applying adhesive to the cover paper and reinforcing strips, applying the treated paper and strips to the web of cardboard, and folding the cover paper and strips around the edges of the cardboard.

The stand of unit A, as shown in Figs. 1 and 2, comprises a pair of front end supports connected by side members 27 with the rear supports 29. The front supports 26 are recessed at 31 to receive the ends of the spindle or shaft 33 upon which the active roll 35 of the cardboard web 37 is supported. A latch 38 is pivoted on the stud shaft 39 between the collars 40 and is provided with a semi-circular recess 41 in the bottom face to fit in the annular groove 42 in the shaft 33 and holds the shaft and roll in their axially adjusted positions. The inner end of stub shaft 39 is externally threaded and is mounted for rotation in an internally threaded bore in theside of the front member 25 by means of hand wheel 44 which the operator will actuate in one direction or the other to bring the roll 35 into desired position.

The rear supports 29 are provided with similar bearing notches 43 and with a latch 45 pivoted on short stub shaft 46 fixed in the rear frame member 29. The latch 45 is provided with a recess on the bottom face which fits within the groove 42 on shaft 47 to hold the latter from axial displacement.

When the active roll 35 of cardboard becomes exhausted, the operator momentarily stops the feeding of the cardboard web and immediately attaches, by adhesive, the rear end of the web 37 to the front end of the web on the reserve or spare roll 49. He then raises the two pivoted latches 38 and 45 and turns them until they hang vertically downward. Then with suitable tackle or other means lifts the shaft 47 out of bearing notches 43 and clear of the shoulders 61 on the top surfaces of the supports 29, lowering the shaft onto the side members 27. Next he starts the feeding of the web 37 from the rear or reserve rolls and as the web is drawn off, the roll rotates and its shaft 47 begins to roll along the top of the side members 27. As soon as the rolling movement begins-the operator withdraws axially the empty or bare shaft 33 from the notches 31 in the front end support 25, leaving these notches free to receive shaft 47 of the reserve roll. When this occurs he returns the latch 38 to horizontal position with its recessed end positioned in the groove 42 in shaft 33. Later, after the new active roll has been reduced substantially in diameter to avoid interference between the front and rear rolls, a shaft 47 hearing a new extra or spare roll of cardboard web is placed in the rear bearing notches 43 and the latch 45 is returned to its normal horizontal position in notch 42.

The stand for the rolls of reinforcing strips and cover paper at the rear end of unit B, best shown in Figs. 4, 5 and 6, comprises a base having front and rear walls and 57 respectively, each provided with top, inturned hearing flanges 59 and connected by the side members 61. Mounted to slide toward and from one another on these bearing flanges are the two side base blocks and middle block 66, having top and bottom guide or retaining lips 67 and 69 on their front and rear edges, which embrace said bearing flanges.

Fixed upon the base blocks 65 are the vertical supports 71 of angle iron construction, each carrying at its top a pair of horizontal supporting bars 73 for the rolls of reinforcing strips, and lower down a shorter supporting bar 75 for the rolls of cover paper. The top bars 73 are notched at 77 to receive the shafts of the active rolls of reinforcing strips 78 and at 79 to receive the reserve rolls 80. The vertical supports 71 are provided with the inclined notches 81 to receive the active roll of cover paper 82, and the vertical notches 83 to receive the inactive or reserve roll 84.

To replace the active rolls of the reinforcing strips, it

4 V is only necessary to lift the bare shafts or spindles 85 out of their notches 77, lift the shafts 87 of the spare or reserve rolls 80 out of their notches '79 and then roll them on their shafts 87 along the horizontal bars 73 until they 5 drop into notches 77. Similarly, a bare cover paper shaft 89 will be removed from the inclined notches 81, and the spare roll 84 lifted and rolled on its shaft 91 along the top of the support 75, and finally lifted to posigtion its shaft in the inclined notches 81.

in order to maintain the active cover paper roll with one edge, that is, the left hand as viewed in Fig. 6, in engagement with the left hand support 71, and also to pp y a suitable tension to the roll, a tension bar 93 is ;.;provided having pins 95 passing loosely through the wall of the right hand support 71, with tension springs 97 surrounding the pins and positioned between the tension bar 93 and the wall of the support 71.

Tension is applied to the reinforcing webs 99 by means gpf the tension bar 101 fixed between the front ends of go each pair of top supporting bars 73, as shown in Fig. 4. As web 99 of the reinforcing strips passes over the tension bar 101 it is pressed against the same by the pressure shoe 103, adjustably mounted upon horizontal arms of the bell crank lever 105 pivoted on pin 107 passing. 2;: hrough the horizontal supporting members 73. A spring 169 secured at one end to the vertical arm of the bell crank lever 105, and at the other to the upward extension 111 of one of the horizontal members 73 presses the qyveb of the reinforcing strip against the tension bar with g suflicient pressure to maintain the desired tension upon the reinforcing strips 99. From .bar 101 the reinforcing strips pass under fixed bar 112 from which they pass to the gluing devices. See Figs. 2, l1 and 16. Tension is applied to the cardboard web 35 of two tension bars 113 under and over which the web is drawn. Tension is applied to the cover paper 115 by bars 116, and 117 beneath which the web passes, supplementing the tension imparted to the web by the tension device shown in Fig. 6,

varying widths for use with varying widths of carboard,

the means for supporting the cover paper rolls and the. rolls of reinforcing strips, including the base blocks 65,

i the vertical supports '71 and the supporting bars 73 and 45 75 are adjustably supported upon the flange 59 of the front and rear walls 55 and 57 of the base of the unit, and means are provided whereby the operator may easily and quickly adjust these parts transversely in accordance Edwith the width of the cover paper web to be used.

These adjusting means, as shown in Figs. 4, 5 and 6. comprise a rotatable shaft 118 mounted at its extremities in the side members 61 of the base and at its middle in the member 66. This shaft is threaded outwardly in bothtjt'clirections from a plain middle portion 119, one section 55 120 having right hand threads, and the other section 121 having left hand threads. The base blocks 65 are provided with bores or holes to receive the shaft 118, and these bores are internally threaded with right and left hand threads corresponding to the threads on the portions an of the shafts within the bores. A hand wheel 122 is fixed upon one projecting end of the shaft by means of which the latter may be rotated in one direction or the other, to adjust the parts for a wider or narrower cover paper web -.and for greater or smaller spacing of the reinforcing rolls 65 from one another.

Means are also provided for adjusting the above mentioned supporting devices for the cover paper roll and the' reinforcing strip rolls as a unit, to bring the web from these rolls into proper register with the cardboard web. 70 These'means comprise the middle base block 66, with its ends mounted to slide along the bearing flanges 59 of the front and rear walls of the base.

Adjacent the rear end of this middle base block 66 is a plain transverse bore to receive the unthreaded middle 75 portion '119 of the shaft 118, being held from movement k 37 by means In order to provide for the use of cover paper webs of lengthwise of said shaft by collars Adjacent the front end threaded middle portion 124 of the second shaft 125 rotatably mounted in the side members 61. Collars 126 are fixed on the shaft to hold the shaft from axial movement. A hand wheel 127 fixed on the end of the shaft 125 provides convenient means for the operator to rotate the shaft 125 thereby moving the middle base block 66 transversely unit, without disturbing the spacing of the supporting means with respect to each other.

In the operation of the laminating machine of the type herein disclosed, the operator makes periodicinsp'ection' of the composite or laminated web delivered from the machine, to see, among other things, if the cover paper its discharge end, sprockets 130, 132, 134 and 136, and chains 131, 133 and 135 with shaft 125. Thus the operator may, without changing his proper register.

The cardboard web 3.7, the two webs of reinforcing material 99, and the web of cover paper 115 are assembled and united by the pressure rolls 137 between which the webs pass. Immediately prior to this assembling and uniting operation, the two reinforcing webs and thecover paper Web are coated with glue or other suitable adhesive, which is applied to the lower faces of the reinforcing strips and the upper face of the glue rolls, the reinforcing strips being reversed or turned through 180 so that the glue'carrying face is uppermost and contacts with thebottom of the cardboard web, 'as does the glued face-of the cover paper. A composite or as his presented to the pressure rolls 137, the web is passed from the tension bars 113 through the edge guiding devices shown generally at 139 in Figs. 1 and 2, and in detail in Figs. 7 to 10. These devices are adjustable not only with respect to one another to accommodate different widthsof web, but also web accurately as it comes to the pressure or assembly mechanism.

Rotatably supported in the front and rear pairs 'of bearing blocks 141 and 143, mounted on the front and rear vertical members 145 and 147', respectively, of the frame, are the front and rear transverse shafts 149 and 151, which carry a middle longitudinal member 153 and two side members 155 having the'depending blocks 156 at their rear and front ends. Fixed upon the top of the side members are the edge guides 157, as shown in Fig. 9.

Adjustment of these edge guides toward and from each other is provided in the following manner. The transverse shafts 149 and 151 are oppositely threaded outwardly from an unthreaded middle portion-159, as shown at 161 and 163 on shaft 149 and at 165 and 167 on' shaft to readjust the supporting position, manipulate the hand Wheel 129' cover paper by means of e i These adjustments are secured by the following 187. Fixed upon the 151 in Fig. '10,:and bores on the front and rear ends of the side members are correspondingly internally threaded to receive the threaded portions of the shafts passing therethrough. Thus when the shafts 149 and 151 are rotated clockwise, as viewed in Fig. 10, the side members and their edge guides will be cause to move apart to accommodate a wider cardboard web. Similarly, when these shafts are rotated in a counterclockwise direction, the members and their edge guides will move towards each other to take a narrower web.

Simultaneous rotation of the adjusting shafts 149 and 151 to maintain parallelism of the edge guides 157 is secured through the sprockets 169 and 171, the right hand ends of the shafts, looking in the direction of movement of the cardboard web, shown by arrows 173, with connecting sprocket chain 175. Shaft 151 is actuated by the operator by means of the hand wheel 177 fixed upon the opposite end of sprocket 171.

In order to adjust the cardboard Web laterally of the 157 and their connected pressure rolls, the edge guides mechanism are arranged for bodily transverse movement as a unit in the following manner. upon the left hand end of the shafts 149 and 151, in the direction of the arrow 173 in Fig. 10, are the externally threaded sleeves 179 and 181 sleeves are the connected by the sprocket chain sleeves 179 on shaft 149 is the hand wheel 189 by means of which, throughthe sprocket and chain connection, the operator adjust'transversely the shafts 149 and the edge guides 157 without altering guides from one another.

and 143. Keyed upon the threaded sprockets 183' and 185' 151, and with them the spacing of such insure lateral movement of sleeves 179 and 181 are rotated by the hand Wheel 189. The gluing mechanism is shown in detail on Figs. 11

and; 12 and on an enlarged scale in Figs. 13 to '16. The

203 are rotatably mounted in two gluing rolls 201 and the frame of the machine, the former'applying glue to the reinforcing strips and the latter to the cover paper. These rolls are geared together by means of gears 205 and 207 fixed upon the shafts 209 and 211 of the rear and front 1201 than gear 207 on shaft 211 of roll 203. Preferably the peripheral speeds of rolls 201 and 203 are slightly lower than the linear speeds of the reinforcing" tapes 99 and of the cover web 115, respectively. These differences in speed, which are taken up by slight slippage of the tapes and web on their gluing rolls, assist in the distribution of the glueover the gluing rolls.

The glue or adhesive is supplied to the bite of the rolls through elbow 217 on the horizontal tion 227. .The rate of discharge of the is regulated by hand valve 229, to by-pass more or less of the glue discharged by the pump and return it to the tank thiough'the connection 231. A cut-off valve 233 is provided in the elbow 217 with actuating handle'235 and connecting rod 237 to prevent dripping of the glue when the machine is out of operation. 'As the glue falls into thebite of the rolls midway their ends, it is spread lengthwise of the rolls by their rotation, any excess which reaches the ends of the rolls being delivered to the collectors 239 held against glue tothe rolls which may be adjusted the ends of the rolls by'the collars 241, and discharged fixed upon the shaft 151 from the 1 .Rotatably mounted passing through internally threaded openings in the bearing block's 141 may simultaneously Collars 191 and 193 fixed upon shaft 149 and collar 195 and pin 197 on shaft 151 both shafts when the threaded Gear 207 vis chain 215 from some suitable a slightly larger gear 205 7 into the inclined trough 243 beneath and returned through pipe 245 to the glue tank 225.

Provision is made for holding the webs of reinforcing strips and the web of cover paper material out of contact with the glue rolls when necessary or desirable, as, for example, when the operation of the machine is to be stopped, and this is done by means of throw-off bar 247 extending beneath the reinforcing strips 99, and the bars 248 and 249 between which the cover paper 115 passes. Bar 247 is carried on onearm 251 of the bell crank lever pivoted at 253 on the frame of the machine, and having on the other arm 255 the spring pressed actuating handle 257 the inner end of which is positioned to enter the recess 258 in the frame of the machine when the handle is lowered. Bars 248 and 249 for the cover paper are mounted on arm 259 of the bell crank lever pivoted on end of bar 117 and actuated by the other arm 261 of the bell crank lever with the spring pressed handle 262 and recess 263.

During normal operation of the machine the bell crank levers are in the position shown in Fig. 11, the bar 247 being lowered and held by gravity out of contact with the reinforcing strips 99 with arm 255 in contact with stop pin 264, and the bars 248 and 249 being raised and held in position with the handle on arm 261 in recess 263 and the web of cover paper in contact with the glue roll 203.

When it is desired to throw these webs out of contact with their respective gluing rolls 201 and 203, as, for example, when the machine is to be brought to rest, the handle 257 will be depressed by the operator to raise bar 247 and lift the reinforcing strips 99 out of contact with their glue roll 201, the inner end of the handle entering recess 258 to lock the handle in lower position. The handle 262 will also be depressed to move the bars 248 and 249 away from the glue roll 203, thus withdrawing the web 115 of cover paper from contact with glue roll 203, the lever being supported in position by the handle 262 engaging the stop pin 264. The position of the web deflecting devices and of the webs is now as shown in Fig. 16.

The reason for the reversal of the reinforcing strips between the glue roll 201 and pressure rolls 137 as indicated at 267 is to permit the glue to be applied to the bottom face of the reinforcing strips, which are afterwards turned upside down so that the glued surfaces will be applied to the bottom surface of the cardboard web 37 In the operation of the machine it sometimes happens that the cover paper or one or both reinforcing strips tears apart between the gluing rolls and pressure rolls, leaving the free end of the web sticking to a glue roll and winding up on the same as the roll continues to rotate. If the web is permitted to accumulate on the roll, the pressure from the other roll will result in breakage or other damage to the rolls and their adjacent mechanism.

In order to avoid the possibility of such damage to one of the rolls, the bearings for the rear roll 201 are in yieldingly supported bearing blocks which normally press roll 201 towards roll 203, but which permit roll 201 .to move away from roll 203 when pressure from the latter roll becomes excessive. Such movement not only prevents the pressure on roll 201 from becoming excessive, at least for a time, but it also serves to actuate the means for cutting off the power supply to stop the machine.

In Fig. 17 is shown in vertical section the above described arrangement wherein bearing members 269 are mounted one on each side of frame 271 of themachine, each member carrying a pair of bearing blocks 273.and 275, the former for shaft 209 of the gluing roll 201 and the latter for shaft 211 of the gluing roll 203. Blocks 275 are fixed and immovable in bearing members 269, but blocks 273 are mounted for horizontal movement toward and from blocks 275 in the openings or recesses 276 of the bearing members 269. Blocks 273 are yieldingly passedtowards blocks 275 by the compression springs 277 engaging at one end the rear faces of blocks 273 and at the other end the closure blocks 279 secured to the end of the bearing members 269. Fixed in the rear end of each bearing block 273 is a stud 281 which is surrounded by the compression spring 277 and extend rearwardly through a bearing in block 279. The rear portion of the stud 281 is externally threaded at 283 and carries an internallythreaded nut 285 fixed within the gear 287. A ball thrust bearing 289 is located between the closure block 279 and the nut 285 to take up the thrust of the compression spring 277. A worm 291 is mounted in closure block 279 in engagement with gear 287, and is actuated by the hand wheel 293 upon the end of the worm shaft.

By actuating the hand wheels the power supply,.and having a depending actuating arm 297 carrying the contact roll 299, positioned to be en gaged by the upstanding lug 301 on the rear bearing block 273. When the latter is forced rearwardly by an acculation of the web wound upon one of the glue rolls, the upstanding lug 301 engages the roll 299 on the depending actuating arm 297 of the micro-switch, tripping the latter to break the power circuit and stop the operation of the machine.

The web of cover material is slightly wider than the web of cardboard 37 so that as the composite web leaves the pressure rolls there is at each edge a narrow margin of the cover paper projecting from beneath the edge of the cardboard web 37 with a narrow reinforcing strip between, as shown face of the strip and the cover paper being coated with glue. As thefinal step in the making of the composite web, .these projecting margins ofcover and reinforcing paper are turned upwardly around the edge of the cardboard, and then downwardly ontothe top surface of the cardboard, by means of a pair of folding devices or plows showngenerally at 303 in Figs. 1 and 2, and in detail in Figs. 18 and 19, and on an enlarged scale in Figs. '20 and 21, and their mode of operation is illustrated in Figs. 22, 23 and 24.

These plows consist of-a bottom strip of metal 305 and a. side strip 307 attached thereto which has its top surface substantially flush with the top surface of the bottom: strip at the entrance end of the device, as shown in Fig. 22, but is progressively turned upwardly until it is vertical midway the end, as shown in Fig. 23, and then inwardly until it is parallel to the bottom strip 305, but spaced therefrom, as shown in Fig. 24, at the discharge endz The plows are so mounted that they may be adjusted toward and from one another to accommodate different widths of web, and are also made slightly yielding, their front ends being movable inwardly toward one another under independent spring pressure and movable outwardly away from one another to take care of slight variations in the width of the cardboard web.

The bottom strips 305 of the plow are mounted upon longitudinally extending flat bars 309 having at their rear and front ends the depending lugs or supporting blocks 311 and 313, respectively. Each of the blocks is provided with a transverse bore internally threaded to receive right and left hand threaded portions of the and 317 respectively, mounted for rotation in bearings carried by the brackets rear and front transverse shaft 315 of the machine. The shafts are sprockets 321 connected by 319 secured to the'frame 293 the operator may adjust the movablebearing blocks 273 at each end of not shown, to the circuit forin Fig. 22, and the exposed top surchain 323 so that when shaft 315 is rotated by its hand wheel 325, shaft 317 will also be rotated in the same direction and to the same extent. Thus the plows may be easily and quickly adjusted toward and from each other to accommodate different widths of webs.

In order to permit each plow to yield slightly at its stud 327 which passes loosely through the rear end of bar 309 with its upper end threaded and screwed firmly into the rear end of a bottom strip 305. See Fig. 22. The front ends of the plow jecting therefrom and engaging the depending fingers 337 fixed upon the side strips 307 of the plow members. See-Fig. 2-1.

The plow members are thus. held yieldingly and independently of one another against the side edges of the web, moving slightly towards and away from one another as slight variations in the width of the web may require, but maintaining close contact at all times to insure the folding of the cover paper tightly around the edges of the cardboard web and reinforcing strips.

From the plows the assembled composite web passes between the final pressure rolls 347 which press the turned over margins of the cover paper 115 and reinforc ing strips 99 down firmly against the top surface of the then discharge the completed.

cardboard web 37 and web from the machine.

The operation of the machine shown in the ing drawings and above of cardboad slightly less accompanydescribed, is as follows; A roll ed in the front of the rear unit A, and'adjusted axially by the operator by means of the hand wheel 44. If. space permits the reserve roll of the same material is mounted in the rear end of the unit.

The stand for the cover is next adjusted in width the cardboard roll.

corresponding to the width of A roll of cover paper slightly wider than the cardboard is mounted at the rear end of the front unit B, with a reserve roll immediately behind it.

The front end of the web from the cardboard roll is now threaded through the machine, passing through tension bars 113, through the edge guides 139, between the idler pressure rolls 137, through the plows 307, and be tween the final driven pressure rolls 347.

The reinforcing strips are led from the rolls over the tension bar 101, beneath the pressure shoe 103, beneath the stationary in raised position to hold the tapes out of contact with front end of the tapes are then given a 180 twist and are passed through the pressure roll 137 beneath the cardboard web through the plows, and then between the final pressure rolls 347.

The cover paper is passed from its roll under fixed tension bars 116 and 117, and thence between rolls 248 and 249 which are in position to hold the cover paper web away from the gluing roll. The web is then passed through the idler pressure rolls 137, beneath the reinforcing tapes and the cardboard web, thence through the plows, and finally through the final pressure rolls 347 which have been rendered inoperative by raising the upper roll by hand actuated devices, not shown.

The cardboard web roll and guides 139 are now adjusted reinforcing strips and the cover paper are adjusted transversely to position in width than the desired width', of the'composite laminated web to be produced is mountpaper and the reinforcing rolls bar 112, over the bar 247 which is then I 0 the strips and the paper properly upon the bottom surface of the cardboard web at the idler pressure rolls.

Preferably the-machine is started lowing manner:

and adjusted to deliver the desired quantity of glue to the being also adjusted toward rotating gluing rolls, roll 201 'or from roll 203 to secure the proper thickness of the film of glue upon the rolls.

Now the machine is stopped to bring the glue rolls to rest.

mentalities, complete composite web the front end of the machine.

If the machine has to be stopped temporarilyfor. any

Having thus described the invention, What is claimed is: l. A laminatingmachine having, in combination, a pair of rolls, mechanism for rotating the rolls in opporolls being held in close relation to joined having provision for causing one web to hear I upon one roll and the other Web upon the other roll, said- Webs passing over the means to join the coated webs. 1 1

2. A laminating machine having, in combination, a pair of rolls, mechanism for coupling the rolls and for rotating them in opposite directions, the rolls beingheld incl'ose relation to form a rolls externally of the bite, and h 5 -ecausing one web to bite, means for supplying a:-

spreadable adhesive-material to the roll surfaces entering the bite, means to adjust the bite of the-rolls-to lfl'issite directions, the rolls being held in close relation to smooth and. spread said material thereon, means for feedinga pair of webs to be joined having provision-for? causing one web to bear upon one roll upon the other roll, said Webspassing over the rolls externally of the bite, and means to join the coatedgwebs.

3..A laminating machine having,

and the other web.

ltilswardly. moving, in combination, a-'-- pair of rolls, apair of gears coupling therolls, mechanism for rotating-the gears, the rolls being held in close relation to formIa bite, means for supplying a spreadable adhesive material. to the roll surfaces entering -the 2035150: feeding a pair of webs bite, means toadjust the biteof the rolls to smooth aridspread said material thereon, means for feeding 'a pair of webs to be joined having provision for causingfo'ne web to bear upon one roll and the other Web upon-the other roll, said webs passing over the rolls externally of the .bite, and means to join the coated webs.

4. A laminating machine having, in combination, a pair of rolls, mechanism for rotating site direction, the rolls being held in close relation to form a bite, and said mechanism producing cliflierent peripheral speeds of. the adjacent roll surfaces-at the bite, means for supplying a spreadable the roll surfaces entering the bite, bite of the rolls to smooth and thereon, means for feeding a pair of webs to be joined the rolls in op'po-.-

adhesive material to means to adjust the spread said material having provision for causing one web to bear upon one roll and the other web upon the other roll, said web's passing over the rolls externally of the bite, and means;

to join the coated webs.

5. A laminating machine having, in combinatioma support to hold a pair of rolls closerelation reform;- a bite, limiting means for one of the rolls defining 'theh closest proximity of the rolls at the bite, said supriort inf eluding means for yieldingly urging the rollsto' close the bite, mechanism for rotating the rolls in opposite tions, means for supplying a spreadable adhesive maform a bite, means for supplying a spreadable adhesive material to the roll surfaces entering the bite, said meansicomprising a reservoir for the adhesive, a pump and connections for delivering the adhesive to the downadjacent faces of the rolls intermediate their ends, scrapers for scraping the excess adhesive from the ends of the rolls, and conductors for conducting such excess to the reservoir, means to adjust the bite of the rolls tosmooth and spread to be joined having provision foreausing one web to bear upon one roll and theother web upon. the other roll, said web passing over the rolls externally of the bite, websn:

.. .Refereuces Cited in the filevof this patent UNITED STATES PATENTS Scribner et al Ian. 4, 1921 1,405,198 Forthingham et a1 Jan. 31, 1922 1,861,824 Smith June 7, 1932 2,029,922 Heckel et al. Feb. 4, 1936 2,050,382 Rowbotham et a1 Aug. 11, 1936 2,068,893 Stuart Jan. 26, 1937 2,130,233 Greenwood Sept. 13, 1938 2,133,933 Daley Oct. 18, 1938 2,176,418 Daley Oct; 17, 1939 2,330,530 Tuttle Sept. 28, 1943 2,366,130 Slavek Dec. 26, 1944 2,368,445 Brandt Ian. 30, 1945 2,382,930 Williams Aug. 14, 1945. 2,406,056 Barrett Aug. 20, 1946 2,428,385 Reynolds Oct. 7, 1947 2,434,795 Glasing et a1 Jan. 20, 1948 2.503,267 Harrison et al. Apr. 11, 1950 rotating the rolls in opposaid material thereon, means;

and means to join the coated 

